人教版高中英语ppt配套课件：必修4 unit 2 section ⅲ

1、课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达Unit 2 Working the land Section Using Language 课件（人教版必修课件（人教版必修4，课标通用），课标通用）课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达.阅读理解阅读理解 Using chemical fertilizers is popular because it can stop crop disease and increase_1_，but longterm use of these fertilizers can cause dam

2、age to the land and even to peoples health.Organic farming is to grow crops with natural but not_2_fertilizers.Organic farmers _3_keeping their soil rich and _4_disease.They prefer using natural waste from animals as fertilizers.They think this makes the soil in their fields _5_ minerals and so more

3、 _6_. 课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达Organic farmers also use many other methods to keep the soil fertile.They often change the kind of crop in each field_7_，or plant crops to use different_8_ of soil，or plant grass between crops to prevent wind or water from _9_ the soil.However，these method

4、s have the same goal：to grow good food and avoid damaging the _10_ or peoples health.答案答案1.production2.chemical3.focus on4.free of/from5.richer in6.fertile7.every few years8.levels9carrying away10.environment课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达.教材研读教材研读一、重点单词熟记一、重点单词熟记1_(adj.)化化学的；关于化学的学的；关于化学的_(n

5、.)化学化学2_(n.)生产；制造生产；制造_(v.)生产生产3_(vt.)发现发现_(n.)发现；发觉发现；发觉4_(vt.)减少；减缩减少；减缩_(n.)减少减少5_(n.)营养；滋养；食物营养；滋养；食物6_(vt.)画底线标出；强调画底线标出；强调7_(n.)总结；摘要；概要总结；摘要；概要8_(n.)评论；议论评论；议论(vi.&vt.)表达意见；作出评论表达意见；作出评论课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达答案答案1.chemical；duction；produce3discover；discovery4.

6、reduce；ment课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达二、重点短语探究二、重点短语探究1build_ 逐逐渐增强；建立；开发渐增强；建立；开发2lead_ 导致；造成导致；造成(后果后果)3focus_ 集中集中(注意力、精力等注意力、精力等)于于4keep.free_ 使使免受免受(影响、伤害等影响、伤害等)； 使使不含不含(有害物有害物)5cause damage_ 对对造成损害造成损害6_ addition 此外；另外此外；另外答案答案1.up2.to3.on4.from/of5.to6.in课前自主导学课前自主导学考点难点易混考点难点易混点点

7、解码书面表达解码书面表达三、教材佳句背诵三、教材佳句背诵1Recently，however，scientists_that longterm use of these fertilizers can cause damage to the land and，even more dangerous，to peoples health.然然而，最近科学家发现长期使用这些肥料会造成土地受而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的是，会对人们的健康造成危害。损，甚至更危险的是，会对人们的健康造成危害。2With these discoveries，some farmers and

8、many customers _organic farming.由于这些发现，一些农民和很多消费者开始转向有机耕由于这些发现，一些农民和很多消费者开始转向有机耕作。作。 课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达3A healthy soil_disease and helps crops_.肥沃的土壤减少了病虫害并且有助于农作物的茁壮成长。肥沃的土壤减少了病虫害并且有助于农作物的茁壮成长。4This also_the air，soil，water and crops_ chemicals.这有助于空气、土壤、水和农作物免受化学物质的污染。这有助于空气、土壤、

9、水和农作物免受化学物质的污染。答案答案1.have been finding2.are beginning to turn to3reduces；grow strong and healthy4.keeps；free from课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达1build up逐渐增强；建立；开发逐渐增强；建立；开发These chemicals in the food supply build up in peoples bodies over time.食食物中的这些化学物质会在人体中逐渐积累。物中的这些化学物质会在人体中逐渐积累。lm very

10、glad to see that your vocabulary is gradually building up.看到你的词汇量在逐渐增加，我很高兴。看到你的词汇量在逐渐增加，我很高兴。He has built up a good business over the years.几年来他生意做得很兴旺。几年来他生意做得很兴旺。Hard working conditions build up character.(喻喻)艰苦的工作条件能磨炼人的性格。艰苦的工作条件能磨炼人的性格。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】写出下列各句中画

11、线部分的汉语意思写出下列各句中画线部分的汉语意思To learn a language well you must build up a useful vocabulary. ()Promote physical culture and build up the peoples health.()答案答案逐渐积累有用的词汇逐渐积累有用的词汇增强人民体质增强人民体质课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达2lead to导致，造成导致，造成(后果后果)；通往；通往Many of these chemicals can lead to cancer or oth

12、er illnesses.这这些化学物质中有很多会引起癌症或其他疾病。些化学物质中有很多会引起癌症或其他疾病。Too much work and too little rest can lead to illness.过量的工作和过少的休息会引发疾病。过量的工作和过少的休息会引发疾病。The road leads to the foot of the hill.这条路通往山脚下。这条路通往山脚下。名师点睛：名师点睛：lead to中的中的to是介词，后面应该接名词或动名是介词，后面应该接名词或动名词作宾语。与词作宾语。与result in/bring about同义，意为：导致。同义，意为：导

13、致。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】一句多译一句多译食食用过多的糖会引起健康问题。用过多的糖会引起健康问题。_答案答案Eating too much sugar can result in health problems.Eating too much sugar can lead to health problems.Eating too much sugar can bring about health problems.课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达3focus n焦点；中心

14、点焦点；中心点vt.集中；聚焦集中；聚焦focus on集中集中(注意力、精力等注意力、精力等)于于They focus on keeping their soil rich and free of disease.他他们主要是想保持土壤肥沃且免受病害。们主要是想保持土壤肥沃且免受病害。She was the focus of everyones attention.她是大家注意的焦点。她是大家注意的焦点。I am too tired to focus on anything.我太累了，不能集中精神了。我太累了，不能集中精神了。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解

15、码书面表达【拓展】【拓展】All our eyes were focused on the speaker.大家的目光都集中在发言人身上。大家的目光都集中在发言人身上。The focus of this chapter is the American Revolution.本章的重点是美国独立战争。本章的重点是美国独立战争。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】英汉互译英汉互译请请集中精力思考下列问题。集中精力思考下列问题。_She always wants to be the focus of attention._答案答案Ple

16、ase focus your minds on the following problems.她她总想成为人们关注的焦点。总想成为人们关注的焦点。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达4reduce vt.减少；减缩减少；减缩A healthy soil reduces disease and helps crops grow strong and healthy.肥肥沃的土壤减少了病害并且有助于农作物的茁壮成长。沃的土壤减少了病害并且有助于农作物的茁壮成长。We were hoping that they would reduce the rent a

17、little.我我们希望他们会把租金降低一点。们希望他们会把租金降低一点。The workforce has been reduced by half.劳动力已经减少了一半。劳动力已经减少了一半。The price of that type of colour TV has been reduced to 1,000 yuan.那种型号的彩电的价格已经下降到了一千元。那种型号的彩电的价格已经下降到了一千元。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】根据句意填入根

18、据句意填入reduce的适当搭配的适当搭配The price _ ten percent.价价格下降了格下降了10%。In the old society he _ finally _ begging.在旧社会，他最后被逼得讨饭。在旧社会，他最后被逼得讨饭。They _ the expenses _ 60 percent.他们将开支压缩了他们将开支压缩了60%。答案答案was reduced bywas；reduced toreduced；by课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达5keep.free from/of使使免受免受(影响、伤害等影响、伤害等)

19、；使；使不不含含(有害物有害物)This also keeps the air，soil，water and crops free from chemicals.这这也使空气、土壤、水和农作物免受化学物质的污染。也使空气、土壤、水和农作物免受化学物质的污染。Youd better keep this area free of air pollution. 你们最好让这个地区免受空气污染。你们最好让这个地区免受空气污染。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【拓展】【拓展】(1)keep sb/sth from doingprevent/stop sb/st

20、hfrom doing阻止某人干某事阻止某人干某事/防止某事发生防止某事发生(2)keep sth from sb不想将某事告诉某人；不想将某事告诉某人； 将某事瞒着某人将某事瞒着某人(3)free vt.释放释放free sth from把把从从释放出来；释放出来；使使摆脱摆脱课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达I just managed to keep myself from falling down.我努力不让自己摔倒。我努力不让自己摔倒。She knew that he was keeping something from her.她知道他有事

21、瞒着她。她知道他有事瞒着她。They freed the birds from the cages.他们把鸟儿从笼子里放出来了。他们把鸟儿从笼子里放出来了。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】完成句子完成句子He wants to _ some of his responsibilities.他他想摆脱他的某些责任。想摆脱他的某些责任。I hope Im not_doing your work.希望我没有妨碍你工作。希望我没有妨碍你工作。答案答案keep himself free fromkeeping you from课前自主导

22、学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达6comment n评论；议论评论；议论vi.&vt.表达意见；作出评论表达意见；作出评论Swap summaries with your partner and give each other comments.与与你的搭档交换概要，然后相互作出评论。你的搭档交换概要，然后相互作出评论。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】根据语境填空根据语境填空Do you have anythi

23、ng to say about the matter? 对对于这件事你有什么要说的吗？于这件事你有什么要说的吗？Sorry，_！对不起，无可奉告！对不起，无可奉告！句型转换句型转换The old lady likes making comments on/about what she has seen.The old lady likes_what she has seen.答案答案no commentcommenting on课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达7They feel that this makes the soil in their f

24、ields richer in minerals and so more fertile.他们觉得这可以让地里的土壤更富含矿物质，从而变得他们觉得这可以让地里的土壤更富含矿物质，从而变得更肥沃。更肥沃。【分析】【分析】(1)此此句为主从复合句。句为主从复合句。(2)句中句中“makes the soil in their fields richer in minerals and so more fertile”为为make复合宾语。其中复合宾语。其中“richer in minerals and so more fertile”为宾语补足语。为宾语补足语。课前自主导学课前自主导学考点难点易混

25、考点难点易混点点解码书面表达解码书面表达课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】仿写句子仿写句子他他们觉得这让他们更加幸福快乐。们觉得这让他们更加幸福快乐。_答案答案They feel that this makes them happier and more cheerful.课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达8Crops such as peas or soybeans put important minerals back into the soil，making it ready fo

26、r crops such as wheat or corn that need rich and fertile soil.像豌豆或大豆这样的农作物将重要的矿物质带回土壤，像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于要求土壤肥沃的农作物，比如小麦或玉从而使之适宜于要求土壤肥沃的农作物，比如小麦或玉米。米。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【分析】【分析】(1)此此句为主从复合句。句为主从复合句。(2)句中含有句中含有that引导的定语从句，修饰先行词引导的定语从句，修饰先行词crops，并且，并且that在从句中充当主语。在从句中充当

27、主语。(3)句中句中“making it ready.”为现在分词短语作结果状语。现为现在分词短语作结果状语。现在分词作结果状语，相当于一个并列谓语，描述谓语动作发在分词作结果状语，相当于一个并列谓语，描述谓语动作发生后所带来的一种自然而然的结果。生后所带来的一种自然而然的结果。Many people from all over the world have moved to America，making it the most multicultural country in the world.来自世来自世界各地的很多人去了美国，使之成为世界上最多元文化的国界各地的很多人去了美国，使之成为

28、世界上最多元文化的国家。家。He cut off the wire，preventing a big fire.他剪断电线，阻止了一场大火。他剪断电线，阻止了一场大火。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【即境活用】【即境活用】_ in a long queue，we waited for the store to open to buy a New iPad.(2012陕西高考陕西高考)AStanding BTo standCStood DStand解析解析考查非谓语动词。句意：我们站在长长的队伍中等商考查非谓语动词。句意：我们站在长长的队伍中等商店开

29、门了买新款店开门了买新款iPad。逻辑主语。逻辑主语we与动词与动词stand之间为主谓之间为主谓关系，故用现在分词短语作伴随状态。关系，故用现在分词短语作伴随状态。答案答案A课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达定语从句定语从句(2)非限制性定语从句非限制性定语从句 应应用透析：非限制性定语从句是对被修饰部分进行附加用透析：非限制性定语从句是对被修饰部分进行附加说明，如果去掉，主句的意思仍然完整或清楚。它和主句之说明，如果去掉，主句的意思仍然完整或清楚。它和主句之间的关系比较松散，因此常用逗号隔开。不用间的关系比较松散，因此常用逗号隔开。不用that引导

30、。引导。课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【语境感悟】【语境感悟】1As we know，littering pollutes the environment.(2012辽宁辽宁)2Last night，I lost my ID card in our campus，which really makes me worried. (2011全国全国)3For lunch，we will prepare dumplings and noodles，which are typical food of China. (2011天津天津)4I know they

31、 are troubled by poverty and diseases，many of whom even have dropped out of school. (2011上海上海)5May 12,2008 was an unforgettable day，when a severe earthquake destroyed almost everything in the school.(2011福建福建)课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达【学以致用】【学以致用】1出出乎我们的意料，天气非常好。乎我们的意料，天气非常好。_2众所周知，月亮围绕地

32、球转。众所周知，月亮围绕地球转。_3我妈妈有本好书，但书的封皮很可怕。我妈妈有本好书，但书的封皮很可怕。_4我们不应该把钱花在给这么多人体检上，他们大部分都我们不应该把钱花在给这么多人体检上，他们大部分都很健康。很健康。_5他写的作文最好，这让我们很意外。他写的作文最好，这让我们很意外。_课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达答案答案1.The weather turned out to be very good，which was more than we could expect.2As is known to all，the moon travels

33、 round the earth.3My mother has a good book，whose cover looks terrible.4We shouldnt spend our money testing so many people，most of whom are healthy.5He wrote the best composition，which surprised all of us.课前自主导学课前自主导学考点难点易混考点难点易混点点解码书面表达解码书面表达假假设你是李华，请就食品卫生问题，给某报社英文栏目设你是李华，请就食品卫生问题，给某报社英文栏目编辑写一封编辑写一封100词左右的信，内容要点如下：词左右的信，内容要点如下：1你的邻居因食用从市场买回来的伪劣食品中毒；你的邻居因食用从市场买回来的伪劣食品中毒；2你目睹了他们中毒及在邻里帮助下脱险的经过；你目睹了他们中毒及在邻里帮助下脱险的经过；3呼吁社会各界重视食品卫生与安全；打击牟取暴利呼吁社会各界重视食品卫生与安全；打击牟取暴利的不法商贩。的不法商贩。注意：注意：信信的开头与落款已给出，不计入总词数。的开头与落款已给出，不计入总词数。参考词汇：伪劣食品参考词汇：伪劣食品fake food；卫生；卫生hygiene【提高训练】